Example of attempting to obtain 50Mbps throughput on point-to-point links:

The actual throughput bit-rate is about half of the bitrate shown in Ubiquiti AirControl

If the radio signal strength is showing very good (i.e., -64 dbm) but the throughput is much lower than your expectation, then the problem is interference.

CCQ is the best benchmark for interference:

98 – 100 CCQ is very good.

50 – 70 CCQ is bad and indicates a lot of re-transmissions

71 to 97 is between good and bad

Falling CCQ is indication of increasing interference in an area.

CCQ is not the percentage of packets that are passing successfully to the other side of the link, but there is correlation between a high CCQ and the percentage of packets that are passing through the link.